Answered my own question. Yep, the diameters have to be in the ratio 2:1 or it doesn't work. Discovered by a 13th century Persian astronomer, apparently.
If you want to see some more of these illusions, take a look here:
Rose-Henig, Alex | Best Illusion of the Year Contest
Coop
[ame=http://www.youtube.com/watch?v=YZf0Q-v3u-k]If you don't revise properly...You Shall Not Pass! - YouTube[/ame]
What was that about?![]()
Ron B.
VK2OTC
2003 L322 Range Rover Vogue 4.4 V8 Auto
2007 Yamaha XJR1300
Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA
RIP Bucko - Riding on Forever
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